Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
cua dang » cua cong, cua ban
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran cao » toan cao, tran chau, trang cho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chiet tach) OR (((hieu lang) OR (hieu quang)))) - thanh trung cua dang cong tac tran cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chiet tach) or (((hieu lang) OR (hieu quang)))) - thanh trung cua dang cong tac tran cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((chiet tach) or (((hieu lang) OR (hieu quang)))) - thanh trung cua dang cong tac tran cao*.